Shuttle check for looms



Jan. 11, 1955 c. P. BERGSTROM ETAL 2,699,134

SHUTTLE CHECK FOR LOOMS Filed March so, 1953 2 Sheets-Sheet 1 INVENTORS CARL R BERGSTROM CLIFFORD DARWIN ATTORNEY United States Patent SHUTTLE CHECK FOR LooMs Carl P. Bergstrorn, Millbnry, and Clifford Darwin, Paxton, Mass, assignors to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application March 30, 1953, Serial No. 345,384

19 Claims. (Cl. 139-187) This is a continuation in part of our co-pending application Serial No. 295,388, filed June 25, 1952, for Shuttle Check for Loom, now abandoned.

This invention relates to improvements in shuttle checks for looms and it is the general object of the invention to provide a simple check effective to exert a checking force on the shuttle as the latter enters the shuttle box but relieve force on the shuttle when it is picked out of the shuttle box.

Fly shuttle looms are customarily made with a reciprocating lay each end of which is equipped with at least one shuttle binder the outer end of which is pivoted with respect to the shuttle box and the inner end of which can move laterally to operate the protector finger. Binders of this type generally exert considerable force on the shuttle when it is picked out of the shuttle box the effect of which is to produce wear of the shuttle picking mechanism, particularly the picker.

It is an important object of the present invention to provide a binder the inner end of which can move transversely of the shuttle box to operate the protector mechanism and the outer end of which is mounted on a link disposed more or less at right angles to the axis of the shuttle box prior to entrance of the shuttle into the shuttle box. A stop limits motion of the binder in the direction in which the shuttle is traveling and cooperates with the link to prevent the outer end of the binder from being moved away from a wall on the opposite side of the shuttle box as the shuttle continues its motion into the box. When the shuttle is picked out of the shuttle box the link is moved angularly with respect to the shuttle box to effect movement of the binder away from the wall to reduce the force exerted on the shuttle and thereby avoid excessive wear of the picking mechanism.

It is another object of the invention to provide a stop to limit motion of the inner end of the binder away from said wall and this second stop cooperates with the first mentioned stop and the link to hold the binder firmly against the shuttle when the latter is boxed.

It is a still further object of the invention to provide a third stop for the binder limiting motion of the aforesaid outer end of the binder away from said Wall as the link turns incident to picking of the shuttle. During the picking operation the second and the third stops will preferably arrest motion of the binder in a direction away from said wall so that the binder can maintain some frictional contact with the shuttle. The three stops control the limits of movement of the binder incident to motion of the shuttle into and out of the shuttle box and whether the binder is against the first or the third of the stops it will be so positioned as to exert some frictional force on the shuttle.

The link in its preferred form comprises two substantially parallel cylindrical members joined by a Web the plane of which is preferably though not necessarily oblique with respect to a plane passing through the axes of the cylindrical members. A modified form of the link has universal joints which permit the binder to adjust itself to have close fitting contact with the shuttle while retaining the features of the preferred form.

The link need not be exactly at right angles to the axis of the shuttle box, and certain of the aforementioned objects can be attained if the link is so disposed with respect to the shuttle box that any force exerted against it by the shuttle as the latter enters the box tending to turn the link will be less than the frictional force existing between 2,699,184 Patented Jan. 11, 1955 the binder and the shuttle resisting movement of the binder in a direction the reverse of the direction of motion of the shuttle into the shuttle box. When the shuttle is in the shuttle box it will remain properly boxed with the binder against the first named stop throughout a period of idleness of the loom and upon resumption of weaving the shuttle will be correctly placed.

In order that the invention may be clearly understood reference is made to the accompanying drawings which illustrate by way of example two embodiments of the invention and in which:

Fig. 1 is a plan view of a loom lay and shuttle box having applied thereto the preferred form a shuttle binder and link forming the subject matter of the present invention,

Fig. 2 is a front elevation looking in the direction of arrow 2, Fig. 1, showing a gang of two shuttle boxes with the upper box in active or picking position,

Fig. 3 is an enlarged detail horizontal section on line 33, Fig. 2, showing the binder in normal position,

Figs. 4 and 5 are detailed vertical sections on lines 44, 55, respectively, Fig. 3,

Fig. 6 is a diagrammatic view showing the position of the binder as the shuttle is moving out of the shuttle box,

Figs. 7 and 8 are diagrammatic views showing the preferred form of link and the binder in two different positions,

Fig. 9 is a view similar to Fig. 1, but showing the modified form of the invention,

Fig. 10 is an enlarged horizontal section, similar to Fig. 3, of the modified form of the invention,

11 is an enlarged vertical section on line 1111, 1g.

Fig. 12 is a detailed horizontal section through the modified form of link taken on the line 12-12, Fig. 11, and

Fig. 13 is a diagrammatic view illustrating the manner in which a binder connected to the modified form of link can adjust itself to a shuttle.

Referring particularly to Figs. 1 and 2 which illustrate the preferred form of the invention, the loom lay L comprises a lay beam 1 having a shuttle race 2 and having the usual protector rod 3, torsion spring 4, and protector finger 5 which tends to move rearwardly, or upwardly as viewed in Fig. 1.

The lay includes a lay end 6 having inner and outer box guide plates 7 and 8, respectively. A gang G of shuttle boxes can be shifted vertically by a box lifter rod 9 and has an inner tongue 11 to slide on plate 7 and an outer tongue 14 to slide on plate 8. As shown more particularly in Fig. 2, the gang G comprises upper and lower shuttle boxes 16 and 17, respectively, the upper box 16, shown in active picking position, having a fiat horizontal top member 18 and a horizontal floor member 19 and the lower box 17 having a horizontal floor member 20. These members 18-20 have forward extensions 21 which are secured to a vertical plate 22 which serves as the first ot the previously mentioned binder stops. Each shuttle box has a shuttle receiving mouth 23 at the inner end thereof, to the right as viewed in Fig. 1, and has also an outer end 24.

The shuttle boxes are made to accommodate two shuttles S1 and S2 and a picker 25 is moved along a picker spindle 26 on the lay end at the proper time in the loom cycle to propel the shuttle which is in the actively placed box. Each shuttle box has a rear shuttle engaging wall 27, and the front inner ends of the boxes are connected by a vertical brace 28 rigid with the boxes and serving as stops, as will be described.

The improved shuttle check forming the subject matter of the present invention comprises a binder and associated parts for each of the shuttle boxes, but a detailed description will be given of only one shuttle check, namely, the one corresponding to the upper shuttle box 16. It is to be understood however that the binder to be described in detail hereinafter is not limited in its use to shifting shuttle boxes and it can if desired be used with a single shuttle box secured to the lay beam 1.

The binder B extends along the shuttle box 16 spaced from wall 27 and comprises a wooden body 35 the inner end 36 of which is between the stop or brace 28 and the protector finger 5. The rear part of the body 35 is provided with the recess 37 in which is located a body of resilient or soft elastic material 38, such as rubber. Extending along the rear part of the binder and behind the body 38 is a wear resisting facing material 39, such as leather. The body 35 is so shaped that the facing material 39 inclines inwardly and forwardly as at 40 near the inner end of the binder, the right hand end as viewed in Fig. 1. That part of the facing 39 extending behind the elastic body 38 may be substantially straight when the shuttle is boxed, as indicated in Fig. l. The leather strip 39 is bent around the outer or left hand end of the wood body 35, Fig. 3, and secured as at 41 to a metallic bearing member 42 secured to the wood body by bolts 43 and 44.

A second bearing member 45 is held to the plate 22 by a screw 46 which extends through a horizontal slot 47 in the plate 22 to permit back and forth adjustment. A third stop 50 is adjustable back and forth in the second bearing 45 and its adjustment is held by a nut 51. The rear part of the stop 50 has a head 52 for engagement with the first bearing member 42 on the binder for a purpose to be described. A clip 53 is held rigidly to the binder by being caught under a nut 54 on the bolt 44, and a second clip 55 is held under the nut 51. Extending between these clips is a tension spring 56 which tends normally to move the binder to the left as viewed in Figs. 1 and 3 to hold the left end of the binder against the plate 22 which acts as a stop limiting left hand motion of the binder, Fig. 1.

The bearing members 42 and 45 are connected by the preferred form of link L which as shown herein 1S formed with front and back cylindrical members 60 and 61, respectively, connected by a web 62. The members 60 and 61 are preferably parallel and with the web 62 constitute a rigid link. The rear bearing member 42 is provided with a vertical parti-cylindrical socket 63 which is open at its top and bottom and has its forward side open. Socket 63 incloses the greater part of the cylinder member 61 to hold the link against forward removal from the bearing member 42. Similarly, the front bearing member 45 has a vertical parti-cylindrical socket 64 for the front cylinder member 60 formed so as to prevent rearward removal of the member 60 from the bearing 45. The link is held in place against lateral displacement relative to its bearings 42 and 45 by having the members 60 and 61 contact more than 180 of the sockets 64 and 63. Bearing member 45 is so placed that the link is aligned vertically with the forward extensions of members 18 and 19 which are therefore able to confine the cylindrical members 60 and 61 to their sockets.

As shown for instance in Fig. 7 the rear end of web 62 may be disposed to the right of the vertical axis of member 61, whereas the front end of the web is disposed to the left of the vertical axis of member 60. The reason for having the plane of the web 62 out of alignment with the axes of the members 60 and 61 and crossing a line joining the axes of these members is to permit ample right hand turning of the link around socket 64 as viewed for instance in Fig. 7 without restraining engagement with the bearing members 42 and 45. The member 60 and socket 64 constitute a primary pivotal connection 65 between the link L and the shuttle box, and similarly the member 61 and the socket 63 form a secondary pivotal connection 66 between the link and the binder.

Prior to arrival of a shuttle in the shuttle box 16 the spring 56 will act as already described to hold the outer end B of the binder against the stop plate 22 which acts as a primary stop and the protector finger due to action of spring 4 will hold the inner end BI of the binder rearwardly away from the secondary stop 28 and against a part 67 of the shuttle box which may be considered a fourth stop limiting movement of inner binder end BI toward the plane of wall 27. Under these conditions the link will be disposed in a position substantially perpendicular to the back wall 27 or the axis of the shuttle box and so located as to prevent forward motion of the outer end of the binder by a force exerted forwardly from wall 27 As the shuttle enters the box its advancing end will engage the inclined part 40 of the binder and move the latter angularly around the secondary pivotal connection 66 without moving the link to move the inner factory.

end BI of the binder forwardly or away from the wall 27 against the secondary stop 28, and in doing so will move the protector finger 5 to rock the protector rod 3 in usual manner. As the shuttle proceeds into the shuttle box with the binder against the primary and secondary stops 22 and 28, respectively, it will be frictionally engaged by the facing 39 and forward motion of the outer end of the binder B will be prevented by the link. During the latter part of the travel of the shuttle into the box the body of elastic material 38 may be compressed, but the binder proper will have no forward motion. Throughout motion of the shuttle into the shuttle box link L will be held against angular motion.

When the shuttle is picked out of the box its frictional engagement with the facing 29 will move the binder B to the right as viewed in Fig. 6, thereby causing the link L to move angularly around the primary pivotal connection 65 and thus move the binder in an inward direction lengthwise of the shuttle box and simultaneously move the outer end of the binder forwardly away from the wall 27. During this motion of the binder its inner end may slide along the stop plate 28, and rearward force on the shuttle will be reduced.

Motion of the binder during picking of the shuttle in a direction lengthwise of the shuttle box will continue until the bearing member 42, acting also as a stop member, engages the head 52 of the third stop 50, after which further angular motion of the link will be arrested. In Fig. 6 arrow [1 indicates the binder B being moved frictionally by the shuttle in a direction out of the shuttle box and at a point along its travel where it is about to release control of the shuttle. When the shuttle leaves the binder, see the dotted line position in Fig. 6, the binder will then be acted upon by springs 4 and 56, spring 4 acting through the protector finger 5 to move the inner end of the binder rearwardly toward wall 27 and spring 56 contracting to return the binder to normal position with its outer end against the primary stop 22. The binder will then be in readiness for the next arrival of the shuttle in the shuttle box.

It is desirable that the shuttle be subject to some control by the binder when being picked out of the shuttle box and to accomplish this result the third stop may be set so that when the binder is against this stop and also against the second stop 28 the elastic mass 38 will be under some compression. To accomplish this result the third stop 50 is preferably set so that when the binder is against it and the second stop 28, and the shuttle is out of the box, the distance between the rear surface of the facing 39 and the wall 27 will be somewhat less than the width of the shuttle.

It may not be necessary in all instances to use the body 38 of soft elastic material, but in looms which operate with two or more shuttles which may vary slightly in width and each of which may enter both shuttle boxes at different times it is desirable to make some provision for the variation in width and the elastic material 38 is of value for this purpose.

The link L rests on and is supported by the floor member 19. If it is desired to replace the link the screw 46 can be removed and the binder and bearing member 45 moved forwardly to a position which will locate the link out of vertical alignment with the members 18 and 19 of the shuttle box. The link can then be slid either down or up out of its open ended sockets 63 and 64 and replaced by another link.

The link may be made of any desired material which will make it substantially rigid. The cylinder members and 61 may be made of nylon, in which case they will operate satisfactorily Without requiring much, if any, lubrication of the sockets 63 and 64. The web 62 may also be made of nylon, but this material is not essential for any part of the link, although it has been found quite satis- Various other materials, principally metallic, have in fact been used in making the link L and it is not desired to limit the invention to the particular material mentioned.

Under continued running operation it has been found that a binder made as set forth hereinbefore checks the shuttle so that only a small amount of energy remains in the shuttle when it strikes the picker 25. As a result there is very little wear of the picker incident to boxing of the shuttle, and because of the fact that the binder swings forwardly to reduce force against the shuttle when the latter is picked out of the box there is also little wear on the picker due to its picking action.

The modified form of the invention shown in Figs. 913 employs much of the matter already described, the principal difference being the character of the link. As shown more particularly in Fig. 10, the binder 69 is connected to a link 70 made preferably of a fiat piece of metal which is fitted with two balls which provide universal joints. The link 70, see Fig. 11, has front and back bearings 71 and 72 forced into holes 73 formed in the link. The bearings are of cylindrical form and each has its periphery provided with lubricant conducting grooves 74 communicating with holes 75 which extend inwardly to the partispherical bearing socket 76.

The sockets of bearings 71 and 72 are fitted with balls 80 and 81 respectively through which extend securing means, such as the studs 82 and 83, respectively. These studs may have a driving fit with their respective balls, or the balls may turn on the studs. If a driving fit is used, stud 82 will be driven into the upper part of a block 85 corresponding to the second bearing member 45 of the preferred form of the invention, through ball 80, and then into the lower part of the block 85. The stud 83 will be similarly secured to ball 81 and to a plate or metallic member 86 on the binder 69 corresponding to part 42 of the preferred form. Due to the universal joints the binder 69 will ordinarily rest on box floor 19.

The forward end of the link 70 is provided with a lubricant fitting 90 which communicates with a passage 91 which in turn communicates with the groove in socket bearing 71. A second passage 92 in the link 70 connects the groove in socket bearing 71 with the groove in socket bearing 72 so that lubricant, such as grease, introduced into the fitting 90 will lubricate the two balls in their sockets and permit the link to turn freely with respect to them not only in a horizontal direction but also in a vertical direction. A spring 93 similar to spring 56 holds the binder 69 against the stop 22 when the parts are in normal position as shown in Fig. 10.

The universal joints between link 70 and the parts 85 and 86 permit the simultaneous longitudinal and transverse movement of the binder already mentioned, but in addition permit a vertical rocking of the binder to enable it to adjust itself to a shuttle having a slightly oblique wall. In Fig. 13 it is assumed that the shuttle 94 has a front wall 95 which is oblique with respect to the floor 19 of the top shuttle box. Prior to entry of such shuttle 94 into the shuttle box the binder will be resting on the box floor 19 with its rear surface 96 more or less perpendicular to the box floor, but when the shuttle engages the binder the latter will be able to turn in a vertical direction so that its surface 96 can have close fitting engagement with the shuttle surface 95. Similarly, the binder can turn if its surface is oblique to a normal shuttle wall. This slight vertical turning of the binder is possible due to the universal joint mounting of the link. If desired, the bearings 71 and 72 can be made integral with the link.

From the foregoing it will be seen that the invention sets forth a simple form of shuttle check comprising a binder pivotally connected to a single link L and normally held by stop 22 against motion in the direction of movement of a shuttle entering the box. Upon first entering the shuttle box the shuttle rocks the binder pivotally around the secondary pivotal connection 66, or the rear universal joint in the modified form, but without moving the link and is thereby able to operate the usual protecting mechanism of the loom. As the shuttle continues into the box the body of elastic material 38, when used, will be compressed slightly. Use of the body 38 avoids the necessity for very accurate setting between the wall 27 and the facing 39. If there is any tendency for link L or 70 to move angularly with respect to the bearing member 45 as the shuttle moves into the box this tendency will be overcome by the frictional resistance between the shuttle and the facing 39 of the binder. Ordinarily this tendency of the link to turn will be very slight or nil. While the link will ordinarily be substantially perpendicular to the axis of the shuttle box it has been found that the link will operate as described even though it is not exactly at right angles to the shuttle box axis. As the shuttle is picked out of the box it will move the binder lengthwise of the shuttle box in the direction of travel of the shuttle due to frictional resistance between the shuttle and the facing 39 and the resultant angular motion of the link around its pivotal connection with the bearing member 45 will move the outer end of the binder forwardly from the wall 27, thereby reducing the rearward force on the shuttle and lessening wear of the picker. The modified form of the invention provides universal joints in the link including balls operatively related to the shuttle box and the binder which enable the binder to adjust itself to the shuttle.

Having now particularly described and ascertained the nature of the invention and in what manner the same is to be performed, what is claimed is:

1. In a loom shuttle box provided with a shuttle engaging wall, a stop on the shuttle box, a binder extending along the shuttle box spaced from said wall, a link pivotally connected to the shuttle box and to the binder adjacent to the outer end thereof mounting said outer end for simultaneous movement lengthwise and transversely of the shuttle box, and a spring normally holding the binder against said stop cooperating with the latter to dispose the link transversely of the shuttle box in position to prevent lengthwise and transverse movements of the outer end of said binder relatively to the shuttle box by a force acting on the binder tending to move the latter away from said wall and in the direction of motion of a shuttle entering the shuttle box, the shuttle when moving out of the shuttle box acting due to frictional engagement with the binder to move the latter in the direction in which the shuttle moves and the link thereupon moving angularly relatively to the shuttle box to cause the outer end of the binder to move away from said wall to reduce the force exerted by the binder on the shuttle.

2. The structure set forth in claim I wherein a universal joint pivotally connects the link and the binder.

3. The structure set forth in claim 1 wherein a universal joint pivotally connects the link to the binder and a secolndbuniversal joint pivotally connects the link to the shutte ox.

4. The structure set forth in claim 1 wherein the end of the link adjacent to the binder is provided with a partispherical bearing socket and a ball operatively related to the binder fits into said parti-spherical bearing socket.

5. The structure set forth in claim 1 wherein the shuttle box and binder have sockets opening toward each other and the link includes cylindrical end members, one member for each socket, rockable in their respective sockets.

6. The structure set forth in claim 5 wherein the cylindrical end members are slidable vertically in said sockets and the shuttle box has vertically spaced substantially horizontal members vertically aligned with said link and the link is pivoted with respect to the shuttle box by means of a bearing member mounted on the shuttle box for removal therefrom to a position in which the link is out of vertical alignment with said horizontal members to enable the link to be removed from said binder and bearing member.

7. The structure set forth in claim 5 wherein the cylindrical end members are parallel and are joined by a web.

8. The structure set forth in claim 5 wherein the end members are vertically disposed and slidable in said sockets and the shuttle box has top and bottom members extending over and under the link to confine said end members to said sockets.

9. The structure set forth in claim 5 wherein the web is of sheet form the plane of which is oblique to and crosses a line joining the axes of the cylindrical members.

It). In a loom shuttle box provided with a shuttle engaging wall, a stop on the shuttle box, a binder extending along the shuttle box spaced from said wall, a link pivotally connected to the shuttle box and to the binder adjacent to the outer end of the latter mounting said outer end of the binder for simultaneous movement lengthwise and transversely of the shuttle box, and a spring normally holding the binder against the stop cooperating with the latter to locate the link in such position transversely of the shuttle box as to prevent movement of the binder away from said wall by the shuttle when the latter enters the shuttle box, the shuttle when moving out of the shuttle box acting due to frictional engagement with the binder to move the latter in the direction in which the shuttle moves and the link thereupon moving angularly relatively to the shuttle box to cause the outer end of the binder to move away from said wall to reduce the force exerted by the binder on the shuttle.

11. In a loom shuttle box gaging wall, a stop along the shuttle provided with a shuttle enon the shuttle box, a binder extending box spaced from said wall, a spring normally holding the binder against the stop, and a link pivotally connected to the shuttle box and binder adjacent to the outer end thereof mounting the outer end of the binder for simultaneous movement lengthwise and transversely of the shuttle box, the spring and stop coperating normally to position the binder so that the link is substantially perpendicular to the axis of the shuttle box, and the stop and link normally cooperating to prevent lengthwise and transverse movement of the binder relative to the shuttle box by a force acting on the binder tending to move the latter away from said wall and in the direction of motion of a shuttle entering the shuttle box.

12. In a loom having a shuttle box provided with a shuttle engaging wall and having also protection mechanism including a protector finger tending normally to move toward the plane of said wall, a stop on the shuttle box, a binder extending along the shuttle box spaced from said wall and having an outer end adjacent to said stop and having an inner end between said wall and finger normally engaging the latter and urged thereby toward the plane of said wall, a single link pivotally connected to the shuttle box and to the binder adjacent to said outer end of the binder mounting said outer end for simultaneous movement lengthwise and transversely of the shuttle box toward and from said wall, and a spring normally holding said outer end of the binder against said stop and cooperating with the latter to dispose the link transversely of the shuttle box to prevent lengthwise and transverse movement of the outer end of said binder relatively to the shuttle box by the shuttle when the latter enters the shuttle box and engages the binder, the inner end of the binder due to pivotal connection of the link with the binder being moved to move said finger away from said wall upon engagement of the binder by a shuttle entering the shuttle box while the outer end of said binder is held in engagement with said stop by said spring.

13. The structure set forth in claim 12 wherein the link has substantially parallel cylindrical end members fitting into sockets formed in the shuttle box and also in the binder.

14. The structure set forth in claim 12 wherein a universal joint pivotally connects the binder and the adjacent end of the link.

15. The structure set forth in claim 12 wherein universal joints pivotally connect the link to both the binder and the shuttle box.

16. The structure set forth in claim 12 wherein a second stop limits motion of the inner end of the binder away from said plane and a third stop limits motion of the outer end of the binder away from said wall, and said second and third stops when engaging their respective ends of the binder as the latter is moved away from the first named stop due to movement of the shuttle out of the shuttle box holding the binder at a distance from the wall less than the width of the shuttle.

17. The structure set forth in claim 12 wherein a second stop limits motion of the inner end of the binder away from said plane and a third stop limits motion of the outer end of the binder away from said wall, the shuttle when moved out of the shuttle box frictionally engaging the binder and moving it away from said first named stop and causing the link to move pivotally and the second and third stops thereupon engaging their respective ends of the binder and arresting further angular motion of the link while the binder is spaced from said wall a distance less than the width of the shuttle.

18. In a loom shuttle box provided with a shuttle engaging wall, a shuttle checking binder extending along the shuttle box and having an outer end, a rigid link pivoted to the binder adjacent to the outer end thereof and pivotally connected to the shuttle box for angular motion relative thereto toward and from said wall, the link mounting the outer end of the binder for simultaneous movements away from the wall and longitudinally of the shuttle box, stop means for the shuttle checking binder, and resilient means tending to hold the binder against said stop means, said stop means and resilient means cooperating normally to dispose said link in such relation with respect to the shuttle box that any force exerted on the link in a direction away from said wall by the shuttle when the latter enters the shuttle box tending to move the binder in a direction opposite to the direction of motion of the shuttle will be overcome by the frictional force between the shuttle and the binder, thereby enabling the frictional force to hold the binder against said stop and prevent movement of the outer end of the binder away from said wall as the shuttle moves into the shuttle box, the shuttle when moving out of the shuttle box causing the binder to move longitudinally of the shuttle box away from said stop means and cause the link to move the outer end of the binder away from said wall to reduce the force exerted by the binder on the shuttle.

19. In a shuttle check for a loom shuttle box having a shuttle engaging wall, a shuttle checking binder extending along the shuttle box and having an outer end, a rigid link pivotally connected to the binder adjacent to the outer end of the binder, a bearing member secured to the shuttle box, a pivotal connection between the link and bearing member around which the link is movable angularly relatively to the shuttle box to etfect movement of the outer end of the binder toward and away from said wall and lengthwise of the shuttle box, a stop for the outer end of the binder limiting movement of the binder in an outward direction, a spring operatively interposed between the bearing member and binder normally holding the latter against said stop to locate the link transversely of the shuttle box to prevent movement of the binder away from said wall by the shuttle when the latter enters the shuttle box, the shuttle when moving out of the shuttle box acting due to frictional engagement with the binder to move the latter in the direction in which the shuttle moves and the link thereupon moving angularly relatively to the bearing member to cause the outer end of the binder to move away from said wall to reduce the force exerted by the binder on the shuttle.

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